From the internet, gather information about the chromosome numbers of five animals and five plants. Correlate the number with the size of organism and answer the following questions.
- Do larger organisms have more number of chromosomes/ cells?
- Can organism with fewer chromosomes reproduce more easily than organisms with more number of chromosomes?
- More the number of chromosomes/ cells greater is the DNA content. Justify.
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| Plant | No. of chromosomes (2n) | Animal | No. of chromosomes (2n) |
| Black mulberry | 308 | Mouse | 40 |
| Rattlesnake fern | 184 | Humans | 46 |
| Pineapple | 50 | Gorilla | 48 |
| Oat | 42 | Elephant | 56 |
| Mango | 40 | Goat | 60 |
- Mango (40) and rattlesnake fern (184) show that size of organism has nothing to do with number of chromosomes.
- Gestation period in elephant is much longer than that in goat. Goat has a larger number of chromosomes than elephant. This shows that an organism with fewer number of chromosomes need not reproduce more easily than organisms with more number of chromosomes.
- Chromosomes are composed of DNA. Hence, it can be said that more the number of chromosomes/ cells greater is the DNA content.
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